Silicone Materials Guide - (PDF) - Stockwell Elastomerics

1 Silicone Sponge and Silicone Rubber Gaskets, Seals, Cushions, and MaterialsSTOCKWELL ELASTOMERICS4749 Tolbut St. Philadelphia PA. f. email: Use Silicone Rubber? Silicone rubber has the combined properties of resilience, high temperature stability, and general inertness, unavailable in any other elastomer. Silicones are generally unaffected by extended exposure to temperatures from -100 to 500 F, and are also resistant to aging and degradation from sunlight and ozone. material Properties of Silicone Rubber Long Term Compression Set Resistance Properly designed Silicone Foam and Silicone Sponge outdoor enclosure gaskets can effectively seal out wind driven rain and dust helping the designer meet NEMA enclosure and IP specifications.

2 Unlike most organic elastomers such as EPDM and neoprene, Silicone maintains its resiliency over a broad temperature range and resists taking a permanent compression Retardant Capabilities Silicone Rubber can be compounded to be flame retardant and achieve UL94V0, UL94V1 and UL94HF1 certifications. Flame retardant closed cell Silicone sponge and Silicone foam gaskets are used in analytical instrumentation, telecommunications equipment and controls used in Mass Transit systems. Even when Silicone rubber burns under extreme temperatures, the by-products are non-toxic and any residual ash continues to provide electrical insulation Regulations Silicone Rubber can be compounded using ingredients that meet FDA regulations for properties such as high tear strength and flexing using platinum based catalysts.

3 These Silicone products are often specified for healthcare, instrumentation, food processing and medical diagnostic equipment applications. Electrical Conductivity Silicone Rubber can be blended with nickel-graphite or silver plated aluminum particles for electrically conductive gaskets that provide EMI (electro-magnetic interference) Shielding for electronic communication equipment. Conductive Silicone is available in sheets or custom molded Discharge (ESD) Solid Silicone rubber can be blended with semi-conductive carbon for ESD properties. Further, closed cell Silicone sponge will accept a surface coating of conductive Silicone for soft gaskets and pads with ESD grounding Conductivity Silicone Rubber can be blended with ceramic powders such as alumina and boron nitride for thermal interface pads that help to dissipate heat from power generating devices in electronics.

4 Thermal interface pads are typically fabricated from gel based silicones which are very soft and The Versatile ElastomerThe designer has a wide range of choices when selecting Silicone rubber gasketing and cushioning Materials . Solid Silicone rubber is available in sheets or continuous rolls from .010 thick to .500 thick, and hardness from 10 Shore A to 80 Shore A. molding compounds especially liquid silicones are readily pigmented to match color chips or Pantone color designations. Closed cell Silicone sponge and Silicone foam is available in continuous rolls from .032 thick to .500 thick and densities ranging from ultra soft to extra firm. Silicone Rubber is available in a broader range of firmness and densities than any other engineering elastomer.

5 Fuel, oil and chemical resistant fluorosilicone is also available. COHR lastic is a Registered Trademark of CHR Industries, a unit of St. Gobain Performance PlasticsBisco Silicones are produced by Rogers CorporationStockwell Elastomerics - On-Site Production CapabilitiesStockwell Elastomerics has chosen to develop broad production capabilities for in-house, fast turn manufacturing of prototypes and low-to-mid volume production runs to serve the needs of customers in the Technology Equipment Sector. This broad range of capabilities enables multiple approaches in solving design challenges and supporting initial production requirements. Stockwell Elastomerics on-site Silicone manufacturing capabilities include.

6 Compression Rubber molding of Silicone , Fluorosilicone and other specialty elastomers injection molding of Liquid Silicone Rubber into Gaskets and Components Water Jet Cutting of Gaskets from Silicone Foam, Silicone Sponge and Solid Silicone Die Cutting of Gaskets, Cushioning Pads and Insulators Application of Pressure Sensitive Adhesives onto Silicone Rubber Custom Laminations and Bonded Assemblies of Silicone Foam, Sponge and Solid Slitting to Width of Roll Materials into Adhesive Backed Silicone Foam GasketingStockwell Elastomerics Can Help with material Selection and DesignStockwell Elastomerics stocks a full inventory of COHR lastic solid and sponge Silicone rubber and Bisco Silicone foam and cast liquid Silicone rubber.

7 And Stockwell Elastomerics has teamed up with several other manufacturers of Silicone compounds and products to provide a broad selection of additional Silicone new product applications, Stockwell Elastomerics has developed this material selection Guide to help determine the best material options to meet new product performance demands. Need prototypes cut from Silicone sheet material ? Send a dxf file to for water jet cut Cell Silicone Sponge is heat cured from gum base Silicone into molded sheets or rotocured into continuous rolls. High Quality Silicone sponge is typically post-cured to improve mechanical properties and high temperature performance. Silicone sponge has a characteristic fabric impression on the skin surfaces.

8 Silicone Sponge generally has better tear and tensile strength than cast Silicone foams, making molded sponge a better choice for demanding mechanical Foam sheet Materials are cast from liquid Silicone compounds - which are catalyzed, rapidly mixed, cast onto a release liner and then cured at elevated temperatures. Many Silicone foam Materials pass UL94 flame ratings. Silicone foams have a smooth surface on one or both surfaces and can be provided from .032 through .500 thick in continuous rolls. Soft, low density grades of Silicone foam are open cell foams, however the medium and higher density Silicone foams can function as effective gaskets for sealing out weather and wind driven rain when enclosures are designed for appropriate gasket deflection.

9 * Compression Force-Deflection, PSI (Compressed 25% at 73 F) per ASTM D 1056. ** Compression Set, %, (Compressed 50% for 22 hours at 212 F) per ASTM D 1056. + Indicates thicknesses that are normally available from on-site inventory. Availability may vary. Materials and thicknesses shown are generally available; please call for estimated delivery cycle and Indicates thicknesses that are unavailable due to production constraints. Other Materials and thicknesses may be available by special order. Most Silicone sponge and foam products are available with acrylic or Silicone polymer pressure sensitive adhesive. See selection on back page. Data Sheets are available for each product, download from Silicone Sponge Rubber and Silicone Foam MaterialsListing of Closed Cell Silicone SpongeProductGradeForce Deflection*Compression Set**Stocked.

10 062 .093 .125 .188 .250 .375 .500 Comments and FeaturesR-10480-SSoft2 - 75 RedN/AN/A+++++ Low Compression Set and High ++++++++High Quality/General + +++++Low Compression Set and High + +++++Low Compression Set/Flame Retardant + +++++Low Compression Set/Flame Retardant + + + Conductive Silicone Surface Coating for ESD + N/AN/AN/AFiberglass Reinforcement Provides Dimensional ++ + N/AN/AThermally Conductive for Heat Transfer over Irregular + ++N/AN/AN/AN/AFluorosilicone, Solvent and Fuel ResistantR-10470-FFirm12-2025 OrangeN/A +++ N/AHigh Quality/General PurposeS-10418-XFExtra Firm18-2410 RedN/AN/AN/A +Extra Firm Density for Cushioning Heavy LoadsListing of Cast Silicone FoamsProductGradeForce Deflection*Compression Set**Stocked.